Jack



Patented Nov. 14, 1922.

WILLIAM L. COUTURE, OF SAN FRANCISCO,

onnrronivrn, AssIeNoR or ONE-FOURTH T0 JOHN J'. .i'tIElDMOND,V OF SACRAMENTO, CALIFORNIA. y,

' JACK. "1

Application filed-May 31,

easy to operate and reliable in operation, the

jack being comparatively simple as to con# struction, formed of-few parts, inexpensive and capable of being readily and easily assembled and disassembled. Y

A further object is to generally improve lifting jacks of the character described so as to render them easierand cheaper to make,

more certain and reliablein operation, strong, durable and capable of greater lifting power, 'with the employment of but a few simply constructed parts, wherebyy the jack may be made comparatively small and light as to weight. y

The invention possesses other advantages and features someof which, with the fore# goingwill be set forth at length in the following description where Ishall outline in full that form of the invention which I have selected for illustration in the drawings accompanying and forming a part of the v present specification. In said drawingsl I have shown one-form of the construction of my invention, but it is to be understood that I do not limit myself to such form since the invention as expressed in the claims may be embodied in a plurality of forms.

Referring to the drawings:

Figure 1 is a side elevation of the this invention.

Figure 2 is a vertical sectional view.

Figure 3 is a horizontal sectional view taken on line 3-3 of Fig. 2 showing the wrench in position for operating the jack. y

In the embodiment of the invention shown in the accompanying drawing the jack is made up of an upright body portion or standard 5 being squared at its lower end as at 6. A. lifting member 7 is extensible from one end of the standard and a base member 8 is extensible from the other end. Means 9 jack of 1921. Serial No. 473,656.

is vprovided for extending and withdrawing the members 7 and 8j "f The standard has a screw threaded bore 10 in which isfreceived-'the screwthreaded stem v11 of the member 7. The lower portion-of the standard has the screw threads l2 of its bore oppositely extended and receives the screw threadedstem 18 oftheibase 8.

When the member 7 is in withdrawn position and the base 8 is engaged with thelower end of the standard, the opposed ends of the stems l11. and 13 are spaced from one another slightly. These stems are bored asatr 14:v so

that the bores aline anda rod 15, which rod is` angular in cross section is slidably but non-rotatably received in the bores 14. The

base member may be provided with' spurs 16 g on its under face to preventslipping and turning thereof. The' lower vend of the standard is enlarged as at 17 to provide a irmbearing for the base.

The means -9 for operating the jack com` prises two independent ratchet devices 18 and 19 respectively, one for extending the members 7 and 8 and the other-for withdrawing said members. The device 18 comprises a ratchet wheel 20 with a square or angular' opening 21 centrally `thereof and teeth 22-on its upper face. Thiswheel slips over the standard, receiving the angular portion 6 thereof in the opening 21 so as lto prevent turning of the wheel on the ,stand-v ard, the lower side ofthe wheel being enf gaged with ythe enlarged-portion 17. A rotary ratchet wheel 23 is'provided with a circular opening 24 loosely receiving the standard 5. This wheel `has ratchet teeth' 25 to provide for rotation of the wheel upon the standard.v When the wrench is engagedand turned so as to cause the wheel 23 to turn,

the standard is rotated and by reason of the oppositely threaded stems on the members 7 and 8 the said members will be extended from opposite ends of the standard. The wrench may be moved in the opposite direction to obtain a newpurchase and leverage as in working the ordinary ratchet tool.

'The device 19 comprises a. ratchet wheel 28 mounted on the portion 6 of the standard so asto be held against rotation on the sta-nd.- ard. A rotatable ratchet wheel 29 cooperatesv te A with the one 28 and has a nut like boss 30. rllhese wheels are identical in construction with the wheels of the device 18. The lower wheel 28 rests upon the upper side of the boss 26 of the wheel 23. The wheels 23, 28 and 29 are vertically movable upon the standard and so move when the wrench is reversed and the wheels 23 and 29 idle onthe standard. The device 19 when operated rotates the standard so as to withdraw the members 7 and 8. To prevent rattling and insure proper rcoopera-tion of the ratchet wheels, said wheels are yieldingly held engaged by a helical expansion spring 31. rlhis spring surrounds the standard and engages a plate 32 mounted on the upper side of the wheel 29. The upper end of the spring is housed in a collar 38 which is adjustably held upon the standard by a set screw 34.

rlhe wheels 20, 23, 28 and 29also the co1- lar 88 plate 32 and spring 81 are capable of being readily and easily removed from the standard. To do this the member 7 is unscrewed and withdrawn from the standard and .the above named parts may be lifted off of the standard. This facilitates repair and renewal of broken or worn parts. The rod prevents relative turning of the stems and insures simultaneous rotation thereof.

lin use, the jack is placed with its base 8 upon a support and the member 6 against the object to be lifted. By fitting the wrench to the wheel 23 and turning .to the left the standard will be rotated so as to simultaneouly extend the base and member 7. This will qiiiclly lift the jack bodily when the base is mounted on the ground or other immovable supporting surface, and at the same time extend the member 6 relative to the standard, with the result that the lifting action is more quickly effected than isv the case with the ordinary jack. To withdraw the base 8 and member 7, or in other words lower the jack, the wheel 29 is turned so as to rotate the standard in the direction which will tale in on the stems for the base 8 and member 7. The friction is placed entirely on the screw threads of the stems and of i the bore of the standard and as these stems iastate are relatively long, the friction is distributed whereby the jack may be operated with ease.

l claim: I

1. In a jack, a standard having a bore extending longitudinally therein from both ends thereof, said bore being oppositely screw threaded, right and left screw threaded stems engaging in said bore and projecting outwardly from the ends of said standard, a base member on one of said stems, a lifting member on the other stem, a ratchet wheel fixed to the standard, a ratchet wheel rotatable upon the standard and cooperative when the first ratchet wheel, means for turning the first ratchet wheel so as to rotate the second ratchet wheel and standard in one direction and similar ratchet means for rotating the standard in another direction.

2. In a jack, a base member, a lifting member, a rotary standard, means for connecting the lifting member and baseI to the ends of the standard which means will simultaneously extend the members when the standard is rotated in one direction and simultaneously withdraw said members when the standard is rotated in the other direction, and means for rotating the standard in either direction comprising ratchet wheels fixed to the standard, other ratchet wheels rotatable on the standard and each cooperating with one of the rst named wheels, and a. member for rotating either of the last named wheels.

3. In a jack, a base member, a lifting member, a rotary standard, means for connecting the lifting member and base to the ends of the standard which means will simultaneously extend the members when the standard is rotated in one direction and simultaneously withdraw said members when the standard is rotated in the other direction, means for rotating the standard in either-direction comprising ratchet wheels fixed to the standard, other ratchet wheels rotatable on the standard and each cooperating with one of the first named whAeels, a member for rotating either of the last named wheels,- and spring means yieldingly holding said wheels together.

f WlLLIAM L. COUTURE. 

